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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbc90c67b2ab5fa8345a8ef1366547012d03ebe6ac3baf2329482d099d64d2d' 
  AND token = '57rzGZ30mraalk1SoJbkrUSngrrs4ka/+F5caBKa6AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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