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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a474507e35e191c7455acd669d5c4efcd793d60cc0ebb42cccbd5aede5e592f0' 
  AND token = '0gbp6O1OSriuE8OK9L8+LrEXDIstNvLC6/M1rPU1X78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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