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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fb0f857fef7771613e94d6b71d69ac322e3ffb09f540a85f90ef4b2cd6dfe2' 
  AND token = 'vSwYa5Ql4hD9JKt9R8m729iDPhPxvz+Co6cLs5sD4n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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