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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468bb2d3565c5f14b762c8faddb8496fe01a464f5f4b3bd651b0e0792f56b02b' 
  AND token = '+A7U2di4WIwyfDa86/xiA0U3aJg9zJ5bm+4NzYK8T+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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