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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99966a4ba9e07d3d473feb164a089a9a6770d60ce001d82a358e512cb68b947c' 
  AND token = '/lao96T2cbXdlW/aW6+ezc+N+Ttk09yOnEvdfaZ1a1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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