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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd833ae7403bf5ad0d676c9829b868a0a7d1b89ade09c2ba244def3b53e18fee' 
  AND token = '2MMELirBMAI8uacCx9ITams027s5ZhQ9jTmE2wpXAgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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