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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204962ba8ce13bb4073b5bd846c6cb9aa72e883c7f4ed041bd72d16b269ca795' 
  AND token = '9oE4Eg6sbB4j+nl/qGD68cczm+YIIAg47TDdZEbLHJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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