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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deee801d876aec64f7d0c30b00fe9a08934aed7a1c4b0e99cd16664e17b516a7' 
  AND token = 'HzDV4QiAjlzYPHRl2qivoZPzGTI8+Jjxpns0mnb6s/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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