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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd144e0945d48328bfb52bc94be2350b435538e3655f3e8038005ee09acb78817' 
  AND token = 'z2j7dH1iSfYVeGj5+QXR4Qu4grX590Cf1ZS4D7UmXKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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