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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68274f0a8a7aba23c9270d41b1ac6a7f573fb9343033b80574b4f61644d70500' 
  AND token = 'nir8Ns3spfteLkQNEYagf0SlqfXKwoBfY8+Ew1t4QCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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