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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ea7e029b2b9464e0cdf5b952cf7275beda5ddf7c8735bbd2799446d642562a' 
  AND token = 'iz51bFkpYEGk4GT/Ornz5/Hfjuy29HCa2tkjceAM/vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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