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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d9ba632c70f0391284a0abc0331ef22be057d6bec22f8c864394602301592d' 
  AND token = 'p0QovlSb4ulaGCFzVHHQjHFxZVhVmLluGS/e0YaV3dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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