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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e40b7756ca3f1da46721ef149183ee67fa8d7b07a35d3099062ccae670d7421' 
  AND token = 'bNzh4+vIJxKYxHxggwA0mgQYo0Y/iS662OFmtaEMIjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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