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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8213e978dd17bddb05ada11098fdc697926a2ab0300f21a215a93f63bbe14f' 
  AND token = 'H4PjLFYsCnb67kjta6hyE3+wWWaM/fP+e7l0kD4L+Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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