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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7100878c4e3b91a054bb3225905dc19c1c8cf4fa422a2be0acc6a9260c7d8af' 
  AND token = 'xijjtj1G8FIt2G+Js5Pl8KdKT6v+vFMcCUsFyXNVi1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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