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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcd08f49ccbb5f011a75e1ce65ecc4e7cc58cd6d700c9e248d245a31297e706' 
  AND token = '6A0TrcWjS12Ko68hujCRhuJswaQou2Xe2Tew3IMv1Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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