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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb49a5602e7420aacc940d42d13681bbe37614a7320948c8aa48a6b3b7186ba7' 
  AND token = 'B4YC13AJXbbc8G80Etm9ESBvy2F2SqCxlPKhMwS/EEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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