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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30eb6104dac972e98310a685d1fca2ac79504ddb28f195efac4a984312627e8f' 
  AND token = 'J2TFU/DUzHif0pgQ0KEqPzcyaA2n1sA6yBU+feP9QLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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