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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd6a9ea982b1f140b721ffe18ed2d6c9fe2c0aad550359a9ff4050a99ca1ac9' 
  AND token = 'VLXi2E9kBGBpm9H3YC/nlQcY+1c8lg30upjbYS5NgqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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