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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04237956926ef02f21d6b8626df5242cc5e152add9cb9e2a6a2682d4fd8706b2' 
  AND token = '4WMd8vdxbULCvRhHbtnyTRlu/WAN12MfVuY0HHB5kDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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