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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941485eaeba2785dd4f8f805ea56c0b8c959279a11bb67881e4585c706436aef' 
  AND token = 'ZbxKy0oBXDQP9ZmMqjRz8vq+fTNW1bchdambURFsDmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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