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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d7719167db49854cb84cd9644f01f22af9c5dfbb463ad24ceec0597d374ba4' 
  AND token = 'mOHUfEtv97m9HTQy9gMj11BPsVyMqg+Q7TFWjlITFjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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