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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fac317f3639beff98e8f0495665cb6e8f50532ca8d454d3e005747e104ab915' 
  AND token = 'UVUVeJ5z3VKbpVrWGOzBu7lQIg7a1NOroNVo4IOE+CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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