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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e673815cbf4f0d4673e3e54ee61c44aaf291b4f1ce153aaf9810575cae01f62' 
  AND token = 'h4VuMkAOHL/29d0+95cS61/nDZrKdV+24MhE2eOGN8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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