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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c386744a8f3f4b9754e6b6d3c834ddb020afc31bb591bcc6fd5b02c803101d9c' 
  AND token = 'eH3p7TeOL1emF9FmO62oKuZdmUsuVGEtsJuZC9FO0Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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