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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26c56b72502fde6432cd477d8b245cdfa48150b342bf782ce8f3b2ddaea9e7c' 
  AND token = 'ito3twQOe+AoNQmxlgTt78+bX4Ue3KADLEdMq0sbP38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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