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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f093c8df11049e56b50c76827cee963dddcece1bb25fa8bdf8cace33ca0d80d3' 
  AND token = '3jLCEauzAXlNS5gnhTAOPFZ9qafmfdLGPf4WRj1gzAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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