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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293531e632eb13efb2b0e595e9815ce73563f75aa6e9a2d63b708cfbd8e929bd' 
  AND token = 'e14g8FPj7hKEelgLxTQheLO+V+XtpasW5g/FjbCv2fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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