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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126910fde1e90822182d4d0792b24d0f10fb8635021e21fa0293abb62e798af8' 
  AND token = 'SBvYFvrtH/nw0+wTwUTZWGg1N+HELE3GH8GtE6U1O5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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