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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa71441877ea22e64cf19acd249310b2e7faf2debcae18c6b41b793f4a2cdd5e' 
  AND token = 'oiwlRbZ/n2yRRELPGT61kr0q6LFcFJREkqJlGAfht8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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