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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041742cf6cf2216f712b79b56b6aa30d1c18542ced0ad8d9ac7e24a558ea09c6' 
  AND token = 'dG0OU8P1oTR7H2VfjnV6gbo4Ird8wnVRk9v+94vz108=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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