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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a73d40bf436093a7ff9411bbcb3e15cbb6c8ef1965f91b3f63c001127e20cd5' 
  AND token = 'oeFqacJGvr1vuq5ax2f6xn9AnDiBF4xzVZFgSnGX/u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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