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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ef2535a6cc5bce0e6a5bfa6c021bd8a41069ec28fa6e7c569c565a2eb04c3d' 
  AND token = 'JUUkspVPBKe2tyVDOeiA4x9kFHN32FD8FAQKwZ3awFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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