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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51aaa3bec4ee16903c572c24eaa40439ee162c122591d19c733809ba39b0383' 
  AND token = '+y9/q14P/q3BJXHNqB+1KOAhYdyW1JtOzPsDCCAtgqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}