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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14405be154fd7f75e45780348498b2e3627c29ec8097e3e9d350774ea93a9e4e' 
  AND token = 'iJ9UipVXCLBKwOuVupsLVHyFVwvvywix4oczhXyCcfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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