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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2a2de879909705222d7a57bdf4adddde6592c2632b60712cd8768232900d57' 
  AND token = 'V+ylo97GYNUSyhgK1iNEYrrhovVtaWQWp0t6YIKXyfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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