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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f22060113c69668ef9b49a741e0ef8cc40ce852eaebed1e6220e425cd31cfb8' 
  AND token = 'zKSPp7LYCTxJIdlXXQueq3AD/LAkaHXjPw4J7mvxVFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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