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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c926a0afe9820bf731cd653052ac6ca2951fd192849f14e522f945ba5bedc92' 
  AND token = 'UyfOf12u9xDisBR7TsOpR2auPncAMT+K0xk0nOdoD2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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