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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3df889e1a5d4ff1632d1a7119d6e0965e0692916741b77a80f16e1e7a0e959' 
  AND token = 'Wzy52ClxeNDJPUx2oAfIGUlL7F9sweTrTV6m257j06E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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