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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d3c3392e08df6c768c1e3c8a1ddd5e1cf93312b3c035904cf8727daf3b82d6' 
  AND token = 'n4IVLEAcn85VYJBvwkX2eGaLdoQAI9NbX5vIZjj0IeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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