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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5d35836d98f5b8acd9ec90dc51def623fa0c27e53e4bbf1f2d5494dc80ffbb' 
  AND token = '1hJqWesj364ACprhJ6sYqA7rYIja7U2iDNBVbxOXPQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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