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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c25c3419d995f34952035c6b2064679e984386d1da2770206b5abb725235c77' 
  AND token = 'P8IbqS5VFvRGv4yjt+Qu8hhWuAcY2f35A54jIY5QA3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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