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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74bc4a007a9f5a1e2db3d6c57aaf027afb95353a8248cf3dcfc70ae59cdfd5c7' 
  AND token = '7KuA6Ln04HJ49EOBl3rnOHdM6aaYvTYF1w6+hv+RVk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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