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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a7f21a1cbb9b8a88fb33cf7ba12672acb83e9a75705eca4d5c011e40abbb46' 
  AND token = '8pX2MQNJtb87ZmmVs6hiuSLfpghb/sEjCC0IEE+nGAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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