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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694790e76a79def8d929915a18e43dd3626a4d634f91c9177f8baaf6a63a1ef5' 
  AND token = '8r0d8wxNCrMdGnNjauiA912H2bJ/257qRIs3xb7ifCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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