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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b10add2d0b9d630cdb72b64813988308bf44ab6f449aa5064bf2d8178e458bf' 
  AND token = 'M1l/1ZKAub6uedUn+bZ270dg10xibWGz/8cqzWbN5Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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