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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db37a8b3055e04006a28d30e145eb743ae43eb7a47aa369dbcaae46775bb8001' 
  AND token = '8ITBI1FnORVXDyZBO6IjTreFzbGUCYVr8GdctspgPzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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