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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89493af062cd8d6c3701c0339b1135554452e516189459c2cbe6051b832f479e' 
  AND token = 'UyZl6N17VF6uLv4NPSiioqEhR+Ozq10cCBr1NzvSXzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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