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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb0a9bd8a8180bf56274eeb488440eccd7cae8afd742a85bde85139fd3e3532' 
  AND token = 'Ioq7a5eKlq+oxLj6YXg+gmdhx4wKwp0ZqiZ367hZWUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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