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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8fda60c4b397204e0c1e1688ef8b1e8e35c4ccbceacd66f71c6e1a67289512' 
  AND token = 'vDvrHre7w0Nvy+90g3eJjIK3vJUeqMKnW7Z7jsozTyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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