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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475bb3ad1e24af981da98b3987734a5f9768c7724a72800a0039c087dc7b4070' 
  AND token = 'qsJO+OKaor2AwepI8ekgjXbr0uwoXxqDYZt8UHeMpCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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