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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6e840d0ded7e6fd237e31b7eac21d38c4fcbf6bfe79cdcac0f1bf082b2f012' 
  AND token = 'dDEkPzUmDU0bvYhxyezqsNlpf2xsuJlO/75U5muIEi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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