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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634e2c1d7394f5568125fa00b92a7c90d14fd64de80d7627d5b7239c7c172f9a' 
  AND token = 'J+N3AIViTAkyTrqxmDYVjMqfcZp9fiiROilH3gR91/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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