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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1ea247117da8a06efac9cca4c0b9c0cf12d4782eaba21d021727573087bacb' 
  AND token = 'gOj3vdjrYSaq2vLlSSYb3Hac+eZ+U8SdE83V2dDsNSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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